video. >> the first thing the attorneys and the family were concerned about, the didn't see a time stamp but you found one. >> yes. >> how? >> the time stamp is in another stream of video. so you have to be able to access it using special codex. you have to know where to find it but it's there. once the time stamp is located you can then begin to make sense of it and begin to track people. >> by piecing together the time codes, frederik's team found more than 18 minutes of surveillance showing kendrick on january 10th, starting at 7:31 a.m. as he entered school, ending the last time he was seen alive, at 1:09 p.m. in the gym. >> the motion video we're looking at here, and the fact be that we skip time periods when there's no motion is very common. so i'm not really concerned about that part of >> it but what about the blurred image, the only angle that shows the corner where kendrick johnson was found dead? >> the johnsons and their attorneys believe that this was intentionally blurred to hide something. what is your expertise tell you?